This “nedded” to be posted under the Tradin’ Post section, in the Equipment Forum under Chainsaw Parts. These 056 Super mufflers come across Fleabay quite often, keep watching for one.
By the way, the Super 056 muff used only one single side exit tube & has a blinded off front cover.
I’d look for a magnum muffler with 2 ports, it has the tube in the side like your Super, plus an open port in the front too. Bolts up the same way.
They run a lot cooler that way.